1; This test is attempting to detect when we request forced re-alignment of the
2; stack to an alignment greater than would be available due to the ABI. We
3; arbitrarily force alignment up to 32-bytes for i386 hoping that this will
4; exceed any ABI provisions.
5;
6; RUN: llc < %s -mcpu=generic -stackrealign -stack-alignment=32 | FileCheck %s
7
8target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32-S128"
9target triple = "i386-unknown-linux-gnu"
10
11define i32 @f(i8* %p) nounwind {
12entry:
13  %0 = load i8, i8* %p
14  %conv = sext i8 %0 to i32
15  ret i32 %conv
16}
17
18define i64 @g(i32 %i) nounwind {
19; CHECK-LABEL: g:
20; CHECK:      pushl  %ebp
21; CHECK-NEXT: movl   %esp, %ebp
22; CHECK-NEXT: pushl
23; CHECK-NEXT: pushl
24; CHECK-NEXT: andl   $-32, %esp
25; CHECK-NEXT: subl   $32, %esp
26;
27; Now setup the base pointer (%esi).
28; CHECK-NEXT: movl   %esp, %esi
29; CHECK-NOT:         {{[^ ,]*}}, %esp
30;
31; The next adjustment of the stack is due to the alloca.
32; CHECK:      movl   %{{...}}, %esp
33; CHECK-NOT:         {{[^ ,]*}}, %esp
34;
35; Next we set up the memset call.
36; CHECK:      subl   $20, %esp
37; CHECK-NOT:         {{[^ ,]*}}, %esp
38; CHECK:      pushl
39; CHECK:      pushl
40; CHECK:      pushl
41; CHECK:      calll  memset
42;
43; Deallocating 32 bytes of outgoing call frame for memset and
44; allocating 28 bytes for calling f yields a 4-byte adjustment:
45; CHECK-NEXT: addl   $4, %esp
46; CHECK-NOT:         {{[^ ,]*}}, %esp
47;
48; And move on to call 'f', and then restore the stack.
49; CHECK:      pushl
50; CHECK-NOT:         {{[^ ,]*}}, %esp
51; CHECK:      calll  f
52; CHECK-NEXT: addl   $32, %esp
53; CHECK-NOT:         {{[^ ,]*}}, %esp
54;
55; Restore %esp from %ebp (frame pointer) and subtract the size of
56; zone with callee-saved registers to pop them.
57; This is the state prior to stack realignment and the allocation of VLAs.
58; CHECK-NOT:  popl
59; CHECK:      leal   -8(%ebp), %esp
60; CHECK-NEXT: popl
61; CHECK-NEXT: popl
62; CHECK-NEXT: popl   %ebp
63; CHECK-NEXT: ret
64
65entry:
66  br label %if.then
67
68if.then:
69  %0 = alloca i8, i32 %i
70  call void @llvm.memset.p0i8.i32(i8* %0, i8 0, i32 %i, i32 1, i1 false)
71  %call = call i32 @f(i8* %0)
72  %conv = sext i32 %call to i64
73  ret i64 %conv
74}
75
76declare void @llvm.memset.p0i8.i32(i8*, i8, i32, i32, i1) nounwind
77